Lifting-jack.



No. 845,144. PATENTED FEB. 26, 1907.

J. .4. TAYLOR.

LIPTING JACK.

APPLICATION FILED DEO.5,1905.

W1 TNESSES; NVLL/YTOR.

JAMES A. TAYLOR, OFBIRMINGHAM, ALABAMA.

iFTme-Mok.

To all whom it mag concern:

Be it known that 1, JAMES A.,TAYLOR, a

citizen of the United States, residing: at Birmingham, in the county of; Jefferson 7 and State of Alabama, have invented a new and .useful Lifting-Jack, of which the following is aspecification.

jacent to the end of car, and used for rais- This invention relates to fluid-actuated lifting-jacks, and has for its principal object to provide a jack of simple and compact construction that is adapted especially for use in connection with railwaywork, where it ma be coupled to the train-pipeor steam-pipe'a ing a portion of" the truck in case of a hot box or broken journal.

' A furtherob'ect of the invention is to pro vide a double or compound'ja ck, in which the cylinders are arranged tandem, and each cylinder receives a separate piston, the pistons bein all rigidly connected to a stem. on whic the weight to be raised is imposed.

' A further object of the invention is to provide a compound ack in which all of the parts may examination orrepairs. v p

A still further object of the invention is to provide a jack in which the load-receiving member is provided with a roller or the like on which the weight is imposed, so that in case of movement of the weight the jack will not be injured",

With these and other objects in view, as will more fully hereinafter appear, the invention consists in certain novel features of construction and arrangement of parts hereinafter fully described, illustrated in the accompanying drawing, and particularly pointed out in the appended claims, it being understood that various changes in the form proportions, size, and minor details of the structure maybe made without departing from the spirit or sacrificing any of the advantages of the invention. 7

The accompanying drawing is a sectional perspective view of a lifting-jack constructed in accordance with the invention.

The two cylinders 10 and 11 are preferably provided with a threaded connection, as illustrated, the upper cylinder being of sli htly greater diameter than the lower cylin er, and the top of said lower cylinder forming a support for apartition-plate 12, which forms the bottom of the top cylinder and the top of the lower cylinder, a packingring 13 being preferably introduced be- Specification of Letters Patent.

Applicatio'n filed December 5,1905. saih No. 290.451.

be readily opened and disconnected for ing-s formed in the partition 12 and cap 17,

Patented Feb. 26, 1907.

tween the partition and the edge of said cylinder 10. The lower cylinder is provided with a thickened or reinforced base and has a.

plurality of u wardly-extending flanges or lugs 15, whic limit the downward movement of the piston, so thatair or steam for actuating the jack may freely enter at the.

port 1 6.

The top of the upper cylind eris closed by a detachable trap 17, and in said cap is forrred.

a vent 18, a similar vent 19 being forrr ed in the. upper portion of the wall of .the lower cvlinderto permit the escape of air above the pistons.

Thetwo cylinders 10 and 11 are arranged to receive pistons 20 and 21, respectively, said pistons being rigidly secured to a hollow stem 22. The stem 22 is open at its lower end to permit the passage of air from the lower cylinder'and is provided at a point below the piston 21 with a port 23, through which the air may pass to the u per cylinder, so that pressure may be simu taneously exerted on'bo th pistons.

' The stem 22 extends through suitable openand the top of said stem is closed by a block 25, having a threaded connection with the stem and forming bearings for the support of a roller 26, on which the weight of the truck or other object to be raised is imposed, so that in the event of the :movement of the truck or other object there will be no dangerthatlis secured by bolts or screws 28 to the stem, and the lower portion of said collar is threaded for the reception of a female thread formed in an opening 111 the piston. This connection is further strengthened by bolts 29, extending through the pistons and the flange of the collar. At the eriphery of each piston is a'packing' 30, usua ly in the form of a cupleather, held in place, by ring 31 and bolts 32, and a packing of somewhat similar nature may be employed at the wall of the opening in the partition 12 in order to prevent the escape of a fluid under pressure from the upper to the lower cylinder.

Connected to the inlet-port 16 is a threeway cook 35, to which is connected. a flexible pipe 36, the free end of which is preferably provided with a coupling of the type ordina- 1 5 allowed to exhaust.

with this invention a heavy load may be- 'moved from the cylinder.-

port'for fluid under pressure, pistons ar lying both pistons and provided with a latlow lifting-stem extending through the upper pair of superposed cylinders, a hollow lifting the train-pipe nearest the point where the and maintain the load in elevated position t After the work has been accomplished the cock is turned to release position and the air With a device constructed in accordancev -quickly raised, and the device may 'be made of such snall dia'n' eter as to permit its use. in places where a single piston-jack ot the ordinary type would not be available.

The parts may be opened for examination or repairs by merely unscrewing the cap 17, after which the stem, to gether with its two pistons I and the partition 12 may be re- I claim 1. The combination in a jack, of a pair of superposed cylinders having an admissionranged" in said cylinders, a hollow stem car'- eral port through which the pressure-spaces of both cylinders are placed in communica tion, the upper end ofthe stern extending through the head of the upper cylinder and for ming the load-engaging member.

2. In a lifting-jack, a pair of superposed. cylinders, a partition separating the cylinders, pistons disposed in the cylinders, a hol cylinder and into the lower cylinder, pistons secured to said stem, and means for controlling the admission of fluid under pressure to one of said cylinders.

'3. The combination in a lifting-jack, of a ranged to establish communication between them, pistons secured to the stem, means for limiting downward movement of the piston, and means for admitting fluid under pressure into one of said cylinders.

4. The combination in a lifting-jack, of a pair of superposed cylinders, a partition separating the cylinders and arranged to rest on the upper edge of the lower cylinder, said partition being provided with a central opening, a removable cap or head for the upper i cylinder, a hollow stem extending through the partition, and cap and arranged toestablish communication between the pressurespaces of the two cylinders, a pair of pistons secured to the stem, the pistons, stem and partition being bodily removable fromthe cylinders after the cap is detached, and means at the lower portion of the lower cylinner for controlling the inlet and exhaust of 'fluid under" pressure. I

T he combination in a lifting-jack, of upper and lower cylinders having a threaded connection, a partition resting on the upper edge of the lower cylinder and separating the cylinders from each other, said partition being provided with a central opening, a removable cap orcover for the top of the upper cylinder, a hollow stem arranged to slide through the partition and cap, said stem being adapted to establish communication between the pressure-spaces of the two cylinders, a'roller arranged at the top of the stem for receiving the load, a pair of pistons hav ing threaded openings at their centers, collars bolted to the stem and having threaded portions screwed into such openings, means at the lower end of the lower cylinder for limiting the downward movement of the pistons, and means connected to the lower cylinder for controlling-the admission and exhaust of fluid under pressure.

In testimony that I claim the foregoing as my own I have hereto afllxed my signature in the presence of two witnesses. I

JAMES A. TAYLOR.

WVitnesses: v

C. C. ADAMs,

stem extending into said cylinders and ar- 

